class PersonInfo:
    __weight = 55
    
    def __info(self):
        print(f"我的体重是:{self.__weight}")

    def get__weight(self):
        print(f"体重是:{self.__weight}kg")
        self.__info()


person = PersonInfo()
person.get__weight()
# 直接访问，牛啊
print(person._PersonInfo__weight)
